SHR vs regular RAID – which one is safer?

In comparing SHR to, say, RAID 5 or RAID 6, you state that SHR has the advantage that the data is accessible even after a drive failure, whereas with a RAID configuration the data is inaccessible. Unless I’m misunderstanding what you’re saying, this seems wrong — even in one of your videos, you pull a drive from a RAID 5 array and can still access the data. Can you please elaborate on this supposed SHR advantage? This is on the web page that describes the differences between SHR and RAID.

Second: on the same web page, you write that an SHR advantage is that “Drives can be carrier over to a new SHR supported Synology and the new NAS will see the volume and the data.” Isn’t this equally true of RAID arrays as well?

Third: do you know why, with a new 4-bay DS918+, the “simple” storage pool setup does not support SHR, and that I have to use a “custom” storage pool to have the SHR option?

Lastly: In my particular case, I don’t care a great deal about performance. My main concern is that I would like to ensure that if something happens to my NAS, or even if Synology goes out of business, that I have the greatest chance to recover data from my drives if something happens. That being the case, would RAID or SHR be safer?

I apologise if I have created confusion on some of the articles.
I will try to clarify it.
SHR and regular RAID options work exactly the same way, but the difference is that you can mix a different size drives on the Synology RAID. SHR also supports Synology created functions for keeping your data safe.
With regular RAID options actually it is easier to move your RAID onto a Linux machine to recover. Moving a RAID to a new NAS is equally easy as long as you don’t change the NAS brand.
DS918+ DSM might have accidentally hidden SHR option by default. But it is more beneficial to choose SHR on a Synology.
Both raid types will keep your data equally safe. Regular RAIS is quicker to recover, whereas SHR is more self healing and less likely to get data corrupt.
I hope this helps.

I was revisiting the subject and I think I have taken few btrfs and DSM functions and linked them with SHR.
New Synology update is promised to have smart hot spare technology, which will replace a disk which is expected to fail soon. This will mean that you don’t need to rebuild a RAID any more. Also snapshot technology will protect from few human errors and more.

The answer to you question in short will be that regular raid will be statistically safer just because of recover-ability. In any other way, both RAIDS will be equally safe.

I hope this helps.

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